Piston-cooling device



R. SCHLATTER PISTON COOLING DEVIQCE Apr. 10, 1923.

Filed July 50, 1921 i n-|| M 0 {I'll {Ill v NW "F INVENTOR 60112; ,MdrW

, ATTORNEYS Patented Apr. 10, 1923.

UNITED STATES PATENT OFFICE.

RUDOLPH SCHLATTEB, OF ST. LOUIS. MISSOURI, ASSIGNOR TO BUSCH-SULZER BROS.- DIESEL ENGINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

PISTON-COOLING DEVICE.

Application filed July 30, 1921.

the cooling chamber of the piston, most of it being usually received in some sort of a 5 drainage box, the parts being proportioned to take care of the expected volume. This, however, does not prevent the formation of a considerable amount of spray and scattering of drops of the liquid which, in the absence of special provislon to prevent it, are apt to be drawn with the air out of the telescopic system into the crank case which is objectionable. To avoid this objection without the use of tight fitting stufling boxes, glands or sliding joints, and also without the provision of relatively long and narrow annular spaces between the tubes, such as are employed in the patent to Steinbecker, No. 1,063,615, June 3, 1919, is the main object of my invention, which may be characterized as 'a' non-splashing and in its preferred form non-contacting telescopictube piston-cooling device.

My invention is also directed to the provision of an oil ard by which mixture of oil with the coollng water or other fluid is prevented.

Referring to the single sheet of drawings: Fig. 1 is a side elevation partly in section 40 showing an engine cylinder and part of a crank case to which my piston cooling de= vice has been applied.

Fig. 2 is a vertical detail section on a larger scale than that of Fig. 1 showing the piston in its lower position, and

Fig. 3 is a detail view on a larger scale of the film forming orifice shown in the other figures, this being the form preferred.

The piston 1 is reciprocated in the ordinary way in the cylinder and is provided with a coolin chamber 2 which is in communication with the tube 3 carried b the piston and secured thereto in any sultable way as by the nipple 4. This tube is the scope without contact, there is necessa-' Serial No. 488.516.

movable member of the telescopic connec-- tions. The stationary members constituting a art of the water supply are the delivery tu e 5 and the return or drainage tube or casing 6. The water supply apparatus ineludes the drainage box 7 provided with outlet 8 and vent 9. This box may be conveniently secured to the crank case or elsewhere. The parts thus far described are usual.

In the construction chosen forv illustration I provide a film forming nozzle between the free end of the tube 3 carried by the piston, and the delivery tube 5, the tube 3 being located intermediate the tube 5 and the return or drainage tube 6. This film' forming nozzle may be produced by so proportioning the parts that the space between the interior of the free end of the tube 3 and the exterior of the delive tube 5 is narrow or relatively coratricte with reference to the width of the space between the ipes elsewhere. The water or other coolmg fluid, after being injected under pres sure at high velocit by delivery tube 5 in a solid jet against t e end wall of the cooling chamber of the piston in the usual wa may return through the tube 3, the nozz e formation acceleratin the rate of flow of the fluid and guiding it into more or-less of a film embracing the tube 5 and flowing 35 smoothly along the same to the box, thereby preventing scattering and keeping the liquid from being carried out ofthe system and thus avoiding leakage, or contamination of the crank case oil with water. In roduoing the constriction it is convenient w ere ordinary commercial tubing is employed to insert in the end of the tube 3 a bushing 10, which is preferably provided with the nozzle edge or thin lip 11, which promotes smoothness of flow, and also with a surrounding skirt 12 which acts to interce t and direct downwardly any stray partic es which might leave the smooth stream.

In cooling devices of this general nature 1 heretofore used, difiiculty has been experienced because of oil deposited from the crank case atmosphere and otherwise on the outside of the casing 6, finding its way into the cooling fluid. This difiiculty is obviated by the provision of a tube 14 surrounding casing 6, spaced therefrom and having near its closed end holes 15 through .which any oil which may have reached the interior may escape back to the crank case without danger of mingling with the cooling fluid. Furthermore the system of tubes and especially the tube 3 is protected from deposit of oil by the housing 1' formed in the piston skirt. V

Bythe terms film and film-forming as used in the specification and claims I mean to imply continuity, smoothness and unbroken flow rather than extreme thinness or lack of depth, since the depth of the film or layer would be greater in large than in small engines.

It will be seen from the foregoing specification that the principle and effect of my invention is that the water discharge from the'piston flows to the drainage box in a swift, smooth unbroken stream, and that such effect is the result of the shape and relative arrangement of the parts which control the shape and cross section of the escaping liquid, and it will be understood that other shapes and arrangements of parts adapted to produce the said smooth flowing efiect may be employed with like result within the rinciple of the invention. While the princip e thus explained is applicable' with advantage where separate sets of telescopic tubes are used for supply and drainage, respectively, it is especially valuable where a single set of tubes serves both these urposes and where in consequence the V0 ume of water to be taken care of is greater and the prevention of its escape to the crank case more diflicult.

It will be observed that cooling water cannot mingle with the crank case oil, nor

oil find its way into the cooling system and mingle with the cooling water. This is especially advantageous where salt water is used for cooling.

While for convenience, I have mentioned in the specification and claims a water supply apparatus, I do not of course exclude apparatus for supplying a cooling fluid or cooling fluids other than water.

Claims:

1. In a piston coolin device the combination of a water supp y apparatus, a piston having a cooling chamber, and a tube in communication with said cooling chamber and forming part of extensible connections between said chamber and said supply, said tube having a relatively constricted discharge orifice adapted to produce a smoothflowing discharging stream of water.

2. A piston cooling device comprising a water supply apparatus having a delivery tube and a drainage tube surrounding said delivery tube, a reciprocating piston having a cooling chamber, and a tube in communication w1th the cooling chamber and carried by the piston, located intermediate the delivery and drainage tubes and forming with said delivery tube a discharge passage and a restricted outlet for said passage.

3. A piston cooling device comprising a water supply apparatus having a delivery tube and a drainage tube surrounding the delivery tube, a reciprocating piston having a cooling chamber, and a tube in communication with said chamber and carried b the piston, located intermediate said delivery and drainage tubes but spaced from both, the space between the free or discharge end of said intermediate tube and the delivery tube being locallyrestricted to form an annular nozzle around the delivery tube, said intermediate tube discharging against the outer surface of the delivery tube, which constitutes a guide and acts in cooperation with said intermediate tube and nozzle to form the cooling Water into a stream and accelerate its flow.

4. A piston cooling device comprising water supply apparatus having a delivery tube, a reciprocating piston having a coolin chamber, and a tube in communication wit said chamber carried by said piston and locally restricted near its discharge end, coacting with said delivery tube to form a constricted discharge outlet, and a skirt surrounding and extending beyond said outlet.

5. A piston cooling device comprising a water supply apparatus having a-delivery tube and a drainage tube surrounding said delivery tube, a reciprocating piston having a cooling chamber, and a tube in communication with the cooling chamber and carried by the piston, located intermediate the delivery and drainage tubes and spaced a substantial distance from both except at its free or discharge end where it is relatively constricted and terminates in a thin annular lip and in a skirt of greater radius than.

- said water supply, and an oil guard surrounding and spaced from said telescopic connections adapted to prevent oil finding its way into the cooling fluid.

8. A piston cooling device comprisin a water supply apparatus, a reciprocating piston having a cooling chamber, said water supply apparatus being provided with delivery and drainage tubes, the former within the latter, and the piston carrying a tube intermediate said delivery and dralnage tubes and in communication with said cooling chamber, a tubular oil guard surrounding the drainage tube and provided with holes near its inner end, and a housing for said telescopic tubes carried by the piston.

9. A piston cooling device comprising a water supply apparatus having a delivery tube, a reciprocating piston having a cooling chamber, a tube in communication with said chamber surrounding said delivery tube and carried by the piston, and a bushing mounted in the end of the tube carried by the piston and restricting the space between the end of the said tube and the delivery tube and serving to promote a smooth-flowing discharge.

10. A piston cooling device comprising a water supply apparatus having a delivery tube, a reciprocating piston having a cooling chamber, a tube in communication with said chamber surrounding said delivery tube and carried by the piston, and a bushing mounted in the end of the tube carried by the piston and restricting the space between the end of the said tube and the delivery tube to provide a relatively narrow annular film-forming nozzle, said bushing having also a skirt.

In testimony whereof, I have signed this specification.

- RUDOLPH SCHLATTER. 

